Remove suggested video because not relevant most of the time : based on previously seen video, videos in my subscribs but already seen ...

yt-anti-suggested-video-right-bar.user.js

// ==UserScript==
// @name        yt-anti-suggested-video
// @namespace   yt-anti
// @description remove suggested video because not relevant
// @include     https://www.youtube.com/*
// @version     1.5
// @grant       none
// @require https://cdnjs.cloudflare.com/ajax/libs/zepto/1.1.6/zepto.min.js
// ==/UserScript==
$(document).ready(function () {
  var lang = $("html").attr("lang");
  var regex = /Recommandée pour vous/;
  switch(lang) {
    case "fr":
      regex = /Recommandée pour vous/;
      break;
    case "en":
      regex = /Recommended for you/
      break;
    case "es":
      regex = /Recomendado para ti/
      break;
    case "de":
      regex = /Empfohlenes Video/
      break;
    case "it":
      regex = /Consigliato per te/
      break;
    case "pt": //Brasil
      regex = /Recomendado/
      break;
    case "vi":
      regex = /Được đề xuất cho bạn/
      break;
    default:
      regex = /Recommandée pour vous/;
      break;
  }
  
  var removeSuggestedVideo = function() {
    $(".video-list-item").each(function(i) {
      var suggestedText = $(this).children().find(".view-count").html();
      if (!$.isEmptyObject(suggestedText)) {
        if (suggestedText.match(regex)) {
          $(this).remove();
        }
      }
    });
  };
  
  var time1 = setTimeout(function() {
   removeSuggestedVideo();
  }, 1000);
  
  var time2 = setInterval(function() {
    removeSuggestedVideo();
  }, 60000);
});

version 1 : Array of string to detect.
version 1.1 : Update to a RegEx detection.
version 1.2 : Add isEmptyObject dectection when the .view-count element has other html in it.
version 1.3 : Add setTimeout in order to deal with lazy adding of video suggested.
version 1.4 : Add some other languages support (mainly european).
version 1.5 : Add a setInterval of 1 minute if the previous removal failed, or if some AJAX would add videos.